The answer to 'how much is smoke detector upgrade' is that the cost can vary widely depending on several factors. Upgrading smoke detectors typically ranges from $50 to $200 per detector, including the cost of the new device and professional installation.
The main factors that influence the cost include the type of smoke detector (ionization, photoelectric, or dual-sensor), whether it's a basic model or one with advanced features like Wi-Fi connectivity, and whether you need to replace the entire system or just individual detectors. The number of detectors needed in your home and the complexity of the installation will also affect the overall price.